Impact of vapor pressure on ablation rate of laser-irradiated ablate target

Jiang Xuedong; Chen Jiran; Wang Yu; Wang Chao

doi:10.11884/HPLPB201830.170271

Volume 30 Issue 2

Feb. 2018

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Jiang Xuedong, Chen Jiran, Wang Yu, et al. Impact of vapor pressure on ablation rate of laser-irradiated ablate target[J]. High Power Laser and Particle Beams, 2018, 30: 021002. doi: 10.11884/HPLPB201830.170271

Citation:

Jiang Xuedong, Chen Jiran, Wang Yu, et al. Impact of vapor pressure on ablation rate of laser-irradiated ablate target[J]. High Power Laser and Particle Beams, 2018, 30: 021002. doi: 10.11884/HPLPB201830.170271

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Impact of vapor pressure on ablation rate of laser-irradiated ablate target

doi: 10.11884/HPLPB201830.170271

1.
School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China

Received Date: 2017-06-30
Rev Recd Date: 2017-09-26
Publish Date: 2018-02-15

Abstract

Abstract

The ablation phenomena induced by high energy laser irradiation of carbon/carbon composites and the effect of vapor pressure on the ablation rate are investigated.First, the heat conduction model of the target irradiated by high power laser is set up based on Fourier law. The discontinuous region of Knudsen layer is described and the state parameters of the particles on both sides of discontinuities are analyzed by the Mott-smith approximation method. Then, combined with the mass continuity equation and the relation equation between vapor pressure and temperature equations, and the gas state equation to describe the vapor flow state, the numerical simulation about the relationship of the laser ablation rate of C/C composite material under the condition of vapor pressure with the power change is carried out. The results show that vapor pressure change will lead to the change of target vapor temperature in the process of high energy laser ablation of target, which will affect the ablation rate and make the rate change with power nonlinearly. It is very different from the linear variation when ignoring the vapor pressure. And this theoretically explains the difference between experimental data and theoretical results caused by ignoring the vapor pressure.
- laser,
- vapor pressure,
- ablation rate,
- Knudsen layer

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References(20)

References

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